| Find out where your bleeding off pressure to when the car is off. Could be an injector or oring leaking. Hook fuel pressure gauge on the send line, pinch off return line. Prime fuel system. Pinch the send line so that fuel pressure gauge is isolated inside with the fuel injectors and see if it holds pressure with the car off. If it doesn't you've got either a leaking injector or more likely a leaking injector oring. If it holds pressure then I would do the same test except for prime the system turn off the car and see if it bleeds off. If it does then it's leaking the pump internally. --> replace pump.
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